#include <stddef.h>
#include <stdio.h>

#define HEAPSIZE 0x400
signed char *sbrk(size_t size);
union HEAP_TYPE {
	signed long dummy;
	signed char heap[HEAPSIZE];
};
static union HEAP_TYPE heap_area;
/* End address allocated by sbrk */
static signed char *brk=(signed char *)&heap_area;
signed char *sbrk(size_t size)
{
	signed char *p;
	if(brk+size > heap_area.heap+HEAPSIZE) {
	p = (signed char *)-1;
	}
	else {
		p = brk;
		brk += size;
	}
	return p;
}
